Fixes #21: DOCKER iptables chain problem when used with geerlingguy.firewall.

tasks/main.yml

@@ -6,7 +6,10 @@
   when: ansible_os_family == 'Debian'
 
 - name: Install Docker.
-  package: name={{ docker_package }} state={{ docker_package_state }}
+  package:
+    name: "{{ docker_package }}"
+    state: "{{ docker_package_state }}"
+  notify: restart docker
 
 - name: Ensure Docker is started and enabled at boot.
   service:
@@ -14,5 +17,9 @@
     state: started
     enabled: yes
 
+- name: Ensure handlers are notified now to avoid firewall conflicts.
+  meta: flush_handlers
+  when: docker_restart_on_package_change
+
 - include_tasks: docker-compose.yml
   when: docker_install_compose